RDMA/rxe: Enable MW object pool

Currently the rxe driver has a rxe_mw struct object but nothing about
memory windows is enabled. This patch turns on memory windows and some
minor cleanup.

Set device attribute in rxe.c so max_mw = MAX_MW.  Change parameters in
rxe_param.h so that MAX_MW is the same as MAX_MR.  Reduce the number of
MRs and MWs to 4K from 256K.  Add device capability bits for 2a and 2b
memory windows.  Removed RXE_MR_TYPE_MW from the rxe_mr_type enum.

Link: https://lore.kernel.org/r/20210608042552.33275-4-rpearsonhpe@gmail.comSigned-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/sw/rxe/rxe.c

@@ -54,6 +54,7 @@ static void rxe_init_device_param(struct rxe_dev *rxe)
 	rxe->attr.max_cq			= RXE_MAX_CQ;
 	rxe->attr.max_cqe			= (1 << RXE_MAX_LOG_CQE) - 1;
 	rxe->attr.max_mr			= RXE_MAX_MR;
+	rxe->attr.max_mw			= RXE_MAX_MW;
 	rxe->attr.max_pd			= RXE_MAX_PD;
 	rxe->attr.max_qp_rd_atom		= RXE_MAX_QP_RD_ATOM;
 	rxe->attr.max_res_rd_atom		= RXE_MAX_RES_RD_ATOM;

drivers/infiniband/sw/rxe/rxe_param.h

@@ -37,7 +37,6 @@ static inline enum ib_mtu eth_mtu_int_to_enum(int mtu)
 enum rxe_device_param {
 	RXE_MAX_MR_SIZE			= -1ull,
 	RXE_PAGE_SIZE_CAP		= 0xfffff000,
-	RXE_MAX_QP			= 0x10000,
 	RXE_MAX_QP_WR			= 0x4000,
 	RXE_DEVICE_CAP_FLAGS		= IB_DEVICE_BAD_PKEY_CNTR
 					| IB_DEVICE_BAD_QKEY_CNTR
@@ -49,7 +48,10 @@ enum rxe_device_param {
 					| IB_DEVICE_RC_RNR_NAK_GEN
 					| IB_DEVICE_SRQ_RESIZE
 					| IB_DEVICE_MEM_MGT_EXTENSIONS
-					| IB_DEVICE_ALLOW_USER_UNREG,
+					| IB_DEVICE_ALLOW_USER_UNREG
+					| IB_DEVICE_MEM_WINDOW
+					| IB_DEVICE_MEM_WINDOW_TYPE_2A
+					| IB_DEVICE_MEM_WINDOW_TYPE_2B,
 	RXE_MAX_SGE			= 32,
 	RXE_MAX_WQE_SIZE		= sizeof(struct rxe_send_wqe) +
 					  sizeof(struct ib_sge) * RXE_MAX_SGE,
@@ -58,7 +60,6 @@ enum rxe_device_param {
 	RXE_MAX_SGE_RD			= 32,
 	RXE_MAX_CQ			= 16384,
 	RXE_MAX_LOG_CQE			= 15,
-	RXE_MAX_MR			= 256 * 1024,
 	RXE_MAX_PD			= 0x7ffc,
 	RXE_MAX_QP_RD_ATOM		= 128,
 	RXE_MAX_RES_RD_ATOM		= 0x3f000,
@@ -67,7 +68,6 @@ enum rxe_device_param {
 	RXE_MAX_MCAST_QP_ATTACH		= 56,
 	RXE_MAX_TOT_MCAST_QP_ATTACH	= 0x70000,
 	RXE_MAX_AH			= 100,
-	RXE_MAX_SRQ			= 960,
 	RXE_MAX_SRQ_WR			= 0x4000,
 	RXE_MIN_SRQ_WR			= 1,
 	RXE_MAX_SRQ_SGE			= 27,
@@ -80,16 +80,21 @@ enum rxe_device_param {
 
 	RXE_NUM_PORT			= 1,
 
+	RXE_MAX_QP			= 0x10000,
 	RXE_MIN_QP_INDEX		= 16,
 	RXE_MAX_QP_INDEX		= 0x00020000,
 
+	RXE_MAX_SRQ			= 0x00001000,
 	RXE_MIN_SRQ_INDEX		= 0x00020001,
 	RXE_MAX_SRQ_INDEX		= 0x00040000,
 
+	RXE_MAX_MR			= 0x00001000,
+	RXE_MAX_MW			= 0x00001000,
 	RXE_MIN_MR_INDEX		= 0x00000001,
-	RXE_MAX_MR_INDEX		= 0x00040000,
-	RXE_MIN_MW_INDEX		= 0x00040001,
-	RXE_MAX_MW_INDEX		= 0x00060000,
+	RXE_MAX_MR_INDEX		= 0x00010000,
+	RXE_MIN_MW_INDEX		= 0x00010001,
+	RXE_MAX_MW_INDEX		= 0x00020000,
+
 	RXE_MAX_PKT_PER_ACK		= 64,
 
 	RXE_MAX_UNACKED_PSNS		= 128,

drivers/infiniband/sw/rxe/rxe_verbs.h

@@ -276,7 +276,6 @@ enum rxe_mr_type {
 	RXE_MR_TYPE_NONE,
 	RXE_MR_TYPE_DMA,
 	RXE_MR_TYPE_MR,
-	RXE_MR_TYPE_MW,
 };
 
 #define RXE_BUF_PER_MAP		(PAGE_SIZE / sizeof(struct rxe_phys_buf))